John s



(No Model.)

WITNESSES.

J. s. ADAMS. MAST 0R TOWER.

Patented Dec. 21,1386. 7

x Ill Ill.

llllllll II WIN? [IIIIIIH UNITED STATES PATENT OFFICE.

JOHN S. ADAMS, OF INDIANAPOLIS, INDIANA, ASSIGNOR TO THE JENNEY ELECTRIC COMPANY, OF SAME PLACE.

MAST OR TOWER.

SPECIFICATION forming part of Letters Patent No. 354,758, dated December 21, 1886.

Application filed May 4, 1886. Serial No. 201,069. (No model.)

T 0 all whom it may concern:

- Be it known that I, JOHN S. ADAMS, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Masts or Towers, of which the following is a specification.

The object of my said invention is, first, to produce a tower (principally for electric lights) which shall be comparatively light and at the same, time very strong and rigid, and, second, to provide a means of adjusting the lamps relatively to the tower and to each other. The first object is accomplished by forming the tower of a single mast of comparatively small and preferably hollow round iron, attaching arms to said mast at intervals throughout its length, and securing said arms and mast together by a series of truss-rods, as will be,

parts, Figure l is a perspective view of atower or mast embodying my said invention; Fig. 2, a side elevation thereof; Fig. 3, an elevation, on an enlarged scale, of a portion of said tower; Fig. 4, a top or plan view of the lamps and the basket or cage at the top of the tower,on an enlarged scale; and Fig. 5 adetail elevation of one of the lamps and its support, on astill further enlarged scale.

In said drawings the portions marked A represent the central or main mast of the tower; B, the several cross-arms; C, the trussrods; D, the basket frame-work; E, the lampsupports; F, the lamps, and G the guy-ropes by which the tower isheld at any position.

The main standard or mast A, as before stated, is preferably of hollow round iron such as gas-pipe. It is formed in lengths and coupled together, and each coupling a also preferably has sockets into which the arms B,

which radiate therefrom, enter. At each joint there are preferably four of these arms shown most clearly in Fig. 1, and the trussrods run from each of these joints, except the central one, to the other ends of the arms, as shown most plainly in Fig. 2. Said crossarms are, as shown, of various lengths, the longest ones in the center of the tower, and they decrease gradually in length-from that point toward the ends, being shortest at the top and bottom. These truss-rods C are each provided with a head at one end, which issecured in a link or clip, 0, and are screw= threaded at the other and enter a link or clip, 0, which is also threaded, and thus is the equivalent of a turn-buckle, and these rods are then tightened by turning as desired.

It will be noticed that the mast as a whole is trussed from the center, the truss-rods running from the center cross-arms into the joints of the main. mast above and below, and from the ends of the cross-arms connected to said joints to the joints above and below them, respectively, and so on to the ends of the mast. Outside these arms is also a line of truss-rods, C, running from the top to the bottom and connecting at their ends to the several arms.

The basket or cage D, supporting the lamps,

is secured to the upper end of the mast by trussrods, as shown, and serves the usual purpose of such baskets or cages on towers of this character. The lamp-supports E are each mounted upon the uprights of this cage and are pivoted at each end-a. e., where they connect to the frame of the basket or cage and to the lampbeing constructed in the form of a crank-arm. By this means not only can the lamps be swung around upon their supports, but the supports themselves may be swung in one direction or another, and thus be separated equally, notwithstanding that there may be fewer lamps than supports, it being frequently the case that it is only desired to have four lamps where provision has been made for six or some other number.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of a central pole or mast, A, constructed in sections, and the sections coupled togther by coupling-j oints, cross- IOO said cross-arms to the coupling-joints above and below, and also between the outer ends' of said cross-arms throughout the whole length of the tower, said truss-rods being provided with a head at one end secured in the clip 0, and formed screw-threaded at the other end,

which engages with a threaded holenin the clip 0', and said clips 0 and a secured to said coupling-joints and said outer ends of the crossarms, respectively, substantially as shown and described.

2. The combination of a mast or tower, the cage or basket, the lamps, and thelamp-supports, said lamp-supports being pivoted at both ends, whereby said lamps can be adjusted bodily, and alsoin position on their supports, substantially as shown and described.

3. The combination, in a mast or tower, of

the central pole or mast, cross-arms therefor arranged at intervals throughout its length,

the central ones being the longest and decreasing gradually toward each end, and truss- 

